Police said the blast occurred at 2:35 a.m. outside the broadcaster’s headquarters in a coastal area near Athens after telephoned warnings to a news website and another TV station prompted authorities to evacuate the building.

There was no immediate claim of responsibility. Armed far-left and anarchist organizations have attacked news media outlets in the past.

“This was a strike against democracy. Thankfully, there was only material damage — it’s a relief that no one was hurt — following the swift action taken by the police,” Public Order Minister Olga Gerovasili said.

Greek forensic experts search outside the private Greek television station Skai, after a powerful bomb explosion, in Faliro, Athens, on Monday, Dec, 17, 2018. Police said the blast occurred outside the broadcasters’ headquarters near Athens after telephoned warnings prompted authorities to evacuate the building, causing extensive damage but no injuries. (AP Photo/Petros Giannakouris)

“We will reinforce our democracy. This incident should give pause to those who leave a path open to terrorism and fascism.”

She said anti-terrorism police are leading the investigation. Dozens of police investigators wearing white coveralls collected evidence from the scene, much of which remained cordoned off.

The blast shattered windows and damaged the front of the building, and tore through front offices. Nearby apartment buildings and cars were also damaged.

The explosive device was attached to a metal crash barrier on a busy coastal road in the Faliro area south of Athens.